[FullCustomIC] Cadence Virtuoso_4NAND, 4NOR, 2x1 MUX(Logic)

1.  4NAND Gate

 

⦁ 4NAND Truth Table

VINA	VINB	VINC	VIND	VOUT
0	0	0	0	1
0	0	0	1	1
0	0	1	0	1
0	0	1	1	1
0	1	0	0	1
0	1	0	1	1
0	1	1	0	1
0	1	1	1	1
1	0	0	0	1
1	0	0	1	1
1	0	1	0	1
1	0	1	1	1
1	1	0	0	1
1	1	0	1	1
1	1	1	0	1
1	1	1	1	0

 

(1) : Schematic  /  (2) : Symbol  /  (2) : test

pMOS Width Simulation

 - pMOS w = 2.14u, nMOS w = 1u

4NAND Stick Diagram

4NAND Layout

 - pMOS Finger Width : 2.14u, Total Width : 8.56u

 - nMOS Finger Width : 1u, Total Width : 4u

 

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2.  4NOR Gate

⦁ 4NOR Truth Table

VINA	VINB	VINC	VIND	VOUT
0	0	0	0	1
0	0	0	1	0
0	0	1	0	0
0	0	1	1	0
0	1	0	0	0
0	1	0	1	0
0	1	1	0	0
0	1	1	1	0
1	0	0	0	0
1	0	0	1	0
1	0	1	0	0
1	0	1	1	0
1	1	0	0	0
1	1	0	1	0
1	1	1	0	0
1	1	1	1	0

(1) : Schematic  /  (2) : Symbol  /  (3) : test

pMOS Width Simulation

 - pMOS w = 5.96u, nMOS w = 1u

4NOR Stick Diagram

4NOR Layout

 - pMOS Finger Width : 5.96u, Total Width : 23.84u

 - nMOS Finger Width : 1u, Total Width : 4u

 

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NAND, NOR 비교

 

	2NAND	3NAND	4NAND	2NOR	3NOR	4NOR
pMOS channel Width	2.53u	2.31u	2.14u	3.99u	5u	5.96u

→ NAND 는 channel Width가 점점 줄어들지만 NOR는 channel Width가 점점 늘어난다

⇒ NAND 사용하는 것이 NOR보다 유리(면적 감소)

 

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Logic Gates

: Logic Gate들을 하나의 Layout으로 설계

 

(1) : Schematic  /  (2) : Layout

(1) : DRC  /  (2) : LVS

 

 

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3.  2x1 MUX(Logic)

Schematic상 Trasistor 14개

⦁ 2x1 MUX Truth Table

VINA	VINB	S0	VOUT
A	B	0	A
A	B	1	B

(1) : Schematic / (2) : Symbol / (2) : test

⦁ test set

	VDD	VSS	VINA	VINB	S0
source type	DC 1V	DC 0V	DC 1V	Pulse	Pulse
Voltage range	x	x	x	0 ~ 1V	0 ~ 1V
Period	x	x	x	10ns	100ns
Delay time	x	x	x	0s	0s
Rise time	x	x	x	1ps	1ps
Fall time	x	x	x	1ps	1ps
Pulse width	x	x	x	5ns	50ns
Simulation time	500ns

2x1 MUX Simulation

→ Simulation 결과가 Truth table과 같은 것을 확인할 수 있다.

 

2x1 MUX(Logic) Layout

(좌) : 2NAND pMOS 3개  /  (우) : pMOS 3개를 하나로 합친 layout

→ 2NAND pMOS Layout은 Source-Drain-Source 순이기 때문에 공통 단자인 Source를 합쳐 크기를 줄인다.

(nMOS는 공통 단자가 없어 불가능)

2x1 MUX(Logic) Layout

DRC(Design Rule Check), LVS(Layout Versus Schematic)

 

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Made By Minseok KIM